Brake-shoe.



O. D. PETTIS'.

BRAKE SHOE. APPLICATION IILEDJULY 21, 1913.

1,100,092. Patented June 16, 1914.

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O. D. PETTIS. BRAKE SHOE,

COLUMBIA PLANOGRAPH c0, WASHINGTON, n. c.

APPLICATION FILED JULY 21, 1913.

CLIFTON I). PETTIS, 0F RIDGEWOOD, NEW J ERSEY.

BRAKE-SHOE.

Specification of Letters Patent.

Application filed July 21, 1913.

Patented June 16, 1914. Serial No. 780,312.

To all whom it may concern:

Be it known that I, CLIFTON D. PETTIS, a citizen of the United States,and a resident of Ridgewood, county of Bergen, State of New Jersey, haveinvented certain new and useful Improvements in Brake Shoes, of which Ido declare the following to be a full, clear, and exact description.

My present invention relates more particularly to that class of brakeshoes for railway cars in which the strengthening or reinforcement ofthe back portion of the shoes is effected by means of ductile metalplates, so that as the shoes are reduced by wear, the danger of theircracking and falling from the brake head is avoided. An example of thistype of brake shoes is illustrated in various Letters Patent Nos.1,065,715,1,065,718 and 1,065,719 granted to me under date of June 24,1913.

The invention consists in the features of novelty hereinafter described,illustrated in the accompanying drawings and particularly pointed out inthe claims at the end of this specification.

Figure 1 is a view in side elevation of a brake shoe embodying myinvention. Fig. 2 is a plan view. Fig. 3 is a view in longitudinalsection on line 33 of Fig. 2, the body or wearing portion of the shoebeing omitted. Fig. 4 is a view in longitudinal section on line 44 ofFig. 2. Fig. 5 is an inverted plan view of the pan shaped shellinclosing the back of the shoe. Fig. 6 is a detail view of the blankfrom which the supplemental reinforcing back plate and parts integraltherewith will be formed. Fig. 7 is a view in side elevation of thesupplemental back plate with parts turned up in readiness to be passedthrough the shell. Fig. 8 is a detail view of the blank from which thecenter lug will be formed. Fig. 9 is a view showing the center lug blankpartially folded. Fig. 10 is a view in vertical cross-section on line10-10 of Fig. 1.

The body 12 of my improved brake shoe is preferably formed of castmetal, although other suitable wearing material may be employed. Theupper portion of thebody 12 is inclosed within a pan shaped back 13 thatis preferably connected to the cast metal body 12 (if cast metal beemployed) in the casting operation, in manner well understood by thosefamiliar withthe manufacture of this'class of brake shoes. The panshaped back 13 is formed with side and end walls and within the top ofthis back are punched a plurality of slots 13 and 13 adjacent the endsof the back and a plurality of slots 13 adjacent the center. Within thepan shaped back 13 is placed a reinforcing member consisting preferablyof a supplemental back plate 14 that is formed of ductile metal, thismember or plate 14 being preferably formed with openings 15 between itscenter and ends. The blank from which the back plate 14 will be made, asshown in Fig. 6, will be provided with slits 14 adjacent its ends andthe slits 14 and 14 adjacent its center, so that end prongs or flanges14 and 14 and center prongs or flanges 14 may be formed, as shown inFig. 7 of the drawings. The purpose of the prongs or flanges 14 14 and14 will more fully appear hereinafter, but before the back plate 14 isset within the pan shaped back or shell 13, these prongs will be turnedat approximately right angles to the body of the back plate 14, as shownin Fig. 7, so that the end prongs 14 and 14 will pass through the endslots 13'" and 13 of the shell 13, while the central prongs 14 will passthrough the central slots 13 of the shell.

After the reinforcing back 14 has been placed within the shell 13 withthe prongs or flanges extending through the slots of the shell, as aboveindicated, the end prongs will be bent to form the end lugs of the shoeand the central prongs will be bent to engage the center lug of the shoein manner to be presently stated. That is to say, the central prong 14at each end of the reinforcing back will be bent downwardly andinwardly, as shown in Figs. 1 to 4 of the drawings, thereby forming araised lug that will enter the usual slot at the end of the brake head,and the prongs 14 will be bent upwardly and then downwardly, as clearlyshown in Figs. 1, 2 and 3 of the drawings, to form bearing lugs for theends of the brake head.

When the end lugs are formed by bending the prongs or flanges 14 and 14in the manner above described, they also serve to effectively lock theback plate 14 to the shell 13 and, inasmuch as these end lugs are inltegral with the back plate, all strains thrown upon the end lugs will betransferred directly to the back plate.

After the central prongs or flanges 14 have been bent upward, as shownin Fig.7,

and the back plate 14 has been attached to the shell 13 in manner abovedescribed, the center lug 20 will be interlocked with the prongs orflanges 14?. This center lug 20 is formed from a blank preferably theshape shown in Fig. 8; that is to say, this blank is cut with thelateral tongues or flanges 21 and the end tongues or flanges 22 at itsends. The blank is first bent upon the lines 23, shown in Fig. 8, untilthe portions 24: that are to form the end walls of the lug are atapproximately right angles to the portion of the blank that is to formthe crown of the lug, and the laterally projecting tongues 22 will bebent at substantially right angles to the portions 24; after whichthetongues 21 will be bent against the edges of the tongues 22, as clearlyshown at the left hand portion of Fig. 9 of the drawing. WVhen both endsof the blank have been bent, as-shown at the left hand side of Fig. 9,the center lug will be placed with its box-like ends between theupstanding prongs orflanges 14 of the back plate 14, afterwhich the freeends of the prongs 14: will be bent downwardly around'the tongues orflanges 21 at the ends of'the lugs, so as to securely interlock the lugto the back plate 14: and shell 18, as clearly shown in Figs. 1, 2 and 3ofthe drawings. The center lug will thus be securely interlocked withthe back plate, so that all danger of the center lug pulling, away fromthe body of. the. brake shoe or. becoming loosened or displaced will beavoided. When the parts have been assembled, as above described, theywill be placed. within the mold and the cast metal body, of the. shoewill be unitedwith such parts in the casting operation in mannerfamiliar to those conversant with the manufacture of brake shoes.

' While in the preferred form. of my invention a pan shaped back 13 isused, it is obvious that features of the invention may be employed even,if. the back or shell. 13

be. omitted.

One advantagev of my. present invention,

whether theshell be used or not, isthat all.

thrust and strain on the center and endlug isv transmitted directly totheback, which serves to reinforce theshoe-fromend to end, the back,plate and; the lugs forming an integral bearing for the brake head.Moreover, inasmuch as the parts forming the center and end lugs. projectoutwardly from the back plate 14;, a maximum of wearing surface of thebody of theshoe is afforded, as. nopart projects below the surface oftheback plate. So far as I am aware, also, my invention presents thefirst instance of a brake shoe in which a supplemental back plateplacedwithin an outer-shell has parts integral therewith and projectedoutwardly therefromithrough the back, or. shell, so that all dangerofseparation of. the back. plate from the shell is avoided and the numberof parts is reduced to a minimum.

Manifestly, the precise details of construction above set out may bevaried without departing from the scope of the invention.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is 1. A brake shoe comprising a body having aductile metal reinforcing member provided at its ends with a pluralityof tongues or prongs bent outwardly to form end lugs, the tongues orprongs forming the side portions of said end lugs being reversely bentto give double thickness of metal thereto.

2. A brake shoe comprising a body having a ductile metal reinforcingmember provided at its ends with three tongues or prongs extendinglengthwise of said member, the center prong being longer than the prongson each side thereof, said prongs being bent to form the end lugs of theshoe.

8. A brake shoe comprising a body having a ductile metal reinforcingmember provided adjacent its center and at each side with upwardly-bentintegral prongs, and a center lug provided with projecting tongues orflanges arranged above the reinforcing member and interlocked with saidprongs.

4. A brake shoe comprising a body having a ductile metal reinforcingmember provided at its ends with a plurality of tongues or prongs bentoutwardly to form end lugs and having adjacent its center other tonguesor prongs bent outwardly, and a center lug interlocked with said lastmentioned tongues or prongs.

5. A brake shoe comprising a body having a ductile metal reinforcingmember providec adjacent its center with upwardly-bent tongues or prongsand a center lug having laterally projecting portions with whichprojecting portions said tongues or prongs are interlocked.

6. A brake shoe comprising av body having .a ductile metal reinforcingmember provided adjacent its center with outwardly projecting prongsintegral therewith and a center lug provided at its sides with outwardlyprojecting walls, said tonguesor prongs be in bent over said walls.

A brake shoe comprising a body having a ductile metal reinforcing memberprovided end there0f, said supplemental reinforcingv member havingoutwardly projecting parts extending through said slots of the shell orback and forming means for attachment to the brake head.

9. A brake shoe comprising a body having a ductile metal shell or backand a supplemental reinforcing member within said shell or back andextending approximately from end to end thereof, said supplementalreinforcing member being provided with integral parts projectingoutwardly through said shell or back and overlapping the upper surfacethereof to interlock therewith.

10. A brake shoe comprising a body having a ductile metal shell or back,a supplemental reinforcing member located within said shell or back anda center lug formed separate from said parts, said supplementalreinforcing member being provided with integral parts projectingoutwardly through said shell or back and interlocking with said centerlug.

11. A brake shoe comprising a body having a perforated, ductile metalback and a supplemental reinforcing member within said ductile metalback, said supplemental member having integral prongs projecting throughsaid back, said prongs being bent outside of said back to form the endlugs of the shoe.

12. A brake shoe comprising a body having a perforated, ductile metalback and a supplemental reinforcing member within said ductile metalback, said supplemental member having integral prongs projecting throughsaid back, said prongs extending outside of said back and forming theend lugs of the shoe.

13. .A brake shoe comprising a body provided with a perforated, ductilemetal back, a supplemental reinforcing member Within said perforatedback, said supplemental member having integral prongs at its endspassing through said perforated back and having integral prongs ad acentits center, and a center lug engaged by said last mentioned prongs.

14. A brake shoe comprising a body having a perforated, ductile metalback provided adjacent its ends with slots extending transversely ofsaid back, and a supplemental member within said perforated back andhaving integral prongs extending through the slots of said back, saidprongs being bent outside of said back to form the end lugs of the shoe.

15. A brake shoe comprising a body hav ing a perforated, ductile metalback provided adjacent its ends and adjacent its center with slotsextending transversely of said back and a supplemental member withinsaid perforated back and having integral prongs extending through theslots of said back adjacent the ends and center, the end prongs beingbent outside of said back to form the end lugs of the shoe and a centerlug having laterally projecting portions with which the prongs adjacentthe center are engaged.

CLIFTON D. PETTIS.

Witnesses:

GEO. P. FISHER, J. G. ANDERSON.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, I). G.

